[Sunhelp] strangeness with Plextor CD-ROM and Netra T1

[Bill Bradford]

On Wed, Apr 19, 2000 at 04:59:01PM -0500, Doug McLaren wrote:
> When a scsi device `answers' for all possible SCSI devices this almost
> always means that it has the same ID that the controller itself has.
> I don't know what ID a Netra T1 has it's controller at, but scsi ID's
> 0 and 7 have always been the most common.
> So I'd suggest changing the Plextor's scsi ID.  And make sure you're
> adjusting the correct jumpers, and make sure there aren't other
> jumpers that also adjust the scsi ID (many drives have two sets of
> scsi ID jumpers, and if one is set for ID 6 and the other set for ID 1
> what you'll really see is ID 7 (0110 + 0001 = 0111.))
> | CD-ROM is at ID #6.  The HD is at ID 0 (target 0 unit0).
> | Any suggestions?  Could it be cabling?
> Only if you're referring to the cabling where it picks IDs :)

Found the problem.  Turns out, Plextor doesent use a logical method
of setting the SCSI ID of the drive - instead of adding up SCSI ID
pins "1", "2", and "3", where jumpers on all 3 pins would be ID #6,
instead you have to refer to a chart in the manual (thank goodness for
.PDF files on the web site) and put jumpers on "2" and "3".  This
sets the drive to ID #6.

Jumpering all 3 jumpers sets the drive to ID #7, which is the onboard
SCSI controller in the Sun, causing the behavior Doug described.

Bill

-- 
+--------------------+-------------------+
|   Bill Bradford    |   Austin, Texas   |
+--------------------+-------------------+
| mrbill at sunhelp.org | mrbill at mrbill.net |
+--------------------+-------------------+